I'd assume Prey/lefty is back until proven otherwise. I don't know where this one year loan thing came from but it goes against everything ppl with sources say + Rick is saying
The below link is the only thing I could find that references the loan. And it seems to indicate that Prey was on loan from one team to another, does not reference St. John's as being on a one year loan. So yeah, maybe that doesn't apply here.

Ruben Prey officially committs to Rick Pitino’s St. John’s
The 2005-born Portuguese talent is the latest of several European prospects heading to the NCAA
